It is too soon to determine the ultimate impact van Playrh theory have on our understanding of cognitive development Yet we must recognize. ' that we would not know as much as we do about children's intellectual development without the monumental contributions piaget, nowed ways children seem to differ from adults, and he shed light on how adults acquire fun- damental concepts such as the concepts of space, time, morality, and causality Contemporary researchers have attempted to integrate aspects of Piager's theory into cognitive learning and information-processing theories.